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FreeBSD-SA-09:08.openssl                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Remotely exploitable crash in OpenSSL

Category:       contrib
Module:         openssl
Announced:      2009-04-22
Affects:        All supported versions of FreeBSD.
Corrected:      2009-04-22 14:07:14 UTC (RELENG_7, 7.2-PRERELEASE)
                2009-04-22 14:07:14 UTC (RELENG_7_2, 7.2-RC2)
                2009-04-22 14:07:14 UTC (RELENG_7_1, 7.1-RELEASE-p5)
                2009-04-22 14:07:14 UTC (RELENG_7_0, 7.0-RELEASE-p12)
                2009-04-22 14:07:14 UTC (RELENG_6, 6.4-STABLE)
                2009-04-22 14:07:14 UTC (RELENG_6_4, 6.4-RELEASE-p4)
                2009-04-22 14:07:14 UTC (RELENG_6_3, 6.3-RELEASE-p10)
CVE Name:       CVE-2009-0590

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I.   Background

FreeBSD includes software from the OpenSSL Project.  The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.

The function ASN1_STRING_print_ex is often used to print the contents of
an SSL certificate.

II.  Problem Description

The function ASN1_STRING_print_ex does not properly validate the lengths
of BMPString or UniversalString objects before attempting to print them.

III. Impact

An application which attempts to print a BMPString or UniversalString
which has an invalid length will crash as a result of OpenSSL accessing
invalid memory locations.  This could be used by an attacker to crash a
remote application.

IV.  Workaround

No workaround is available, but applications which do not use the
ASN1_STRING_print_ex function (either directly or indirectly) are not
affected.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the
RELENG_7_2, RELENG_7_1, RELENG_7_0, RELENG_6_4, or RELENG_6_3 security
branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 6.3, 6.4,
7.0, 7.1, and 7.2 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 7.x]
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl.patch.asc

[FreeBSD 6.x]
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl6.patch
# fetch http://security.FreeBSD.org/patches/SA-09:08/openssl6.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libcrypto
# make obj && make depend && make includes && make && make install

NOTE: On the amd64 platform, the above procedure will not update the
lib32 (i386 compatibility) libraries.  On amd64 systems where the i386
compatibility libraries are used, the operating system should instead
be recompiled as described in
<URL:http://www.FreeBSD.org/handbook/makeworld.html>

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

CVS:

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_6
  src/crypto/openssl/crypto/asn1/asn1_err.c                  1.1.1.4.12.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c                  1.1.1.2.10.2
  src/crypto/openssl/crypto/asn1/asn1.h                      1.1.1.7.10.1
RELENG_6_4
  src/UPDATING                                             1.416.2.40.2.8
  src/sys/conf/newvers.sh                                  1.69.2.18.2.10
  src/crypto/openssl/crypto/asn1/asn1_err.c                  1.1.1.4.24.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c              1.1.1.2.10.1.6.1
  src/crypto/openssl/crypto/asn1/asn1.h                      1.1.1.7.22.1
RELENG_6_3
  src/UPDATING                                            1.416.2.37.2.15
  src/sys/conf/newvers.sh                                  1.69.2.15.2.14
  src/crypto/openssl/crypto/asn1/asn1_err.c                  1.1.1.4.22.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c              1.1.1.2.10.1.4.1
  src/crypto/openssl/crypto/asn1/asn1.h                      1.1.1.7.20.1
RELENG_7
  src/crypto/openssl/crypto/asn1/asn1_err.c                   1.1.1.6.2.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c                   1.1.1.5.2.1
  src/crypto/openssl/crypto/asn1/asn1.h                           1.2.2.1
RELENG_7_2
  src/UPDATING                                             1.507.2.23.2.2
  src/crypto/openssl/crypto/asn1/asn1_err.c                   1.1.1.6.8.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c                   1.1.1.5.8.1
  src/crypto/openssl/crypto/asn1/asn1.h                           1.2.8.1
RELENG_7_1
  src/UPDATING                                             1.507.2.13.2.8
  src/sys/conf/newvers.sh                                    1.72.2.9.2.9
  src/crypto/openssl/crypto/asn1/asn1_err.c                   1.1.1.6.6.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c                   1.1.1.5.6.1
  src/crypto/openssl/crypto/asn1/asn1.h                           1.2.6.1
RELENG_7_0
  src/UPDATING                                             1.507.2.3.2.16
  src/sys/conf/newvers.sh                                   1.72.2.5.2.16
  src/crypto/openssl/crypto/asn1/asn1_err.c                   1.1.1.6.4.1
  src/crypto/openssl/crypto/asn1/tasn_dec.c                   1.1.1.5.4.1
  src/crypto/openssl/crypto/asn1/asn1.h                           1.2.4.1
- -------------------------------------------------------------------------

Subversion:

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/6/                                                         r191381
releng/6.4/                                                       r191381
releng/6.3/                                                       r191381
stable/7/                                                         r191381
releng/7.2/                                                       r191381
releng/7.1/                                                       r191381
releng/7.0/                                                       r191381
- -------------------------------------------------------------------------

VII. References

http://openssl.org/news/secadv_20090325.txt
[Note that two of the issues mentioned in the OpenSSL advisory do
not affect FreeBSD.]

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0590

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:08.openssl.asc
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